Creating a SharePoint Solution in .NET

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Creating a SharePoint Solution
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the contents of an Elementsxml file for an event receiver But for other SharePoint project item types for example a list definition the contents of the Elementsxml file will look quite different This can be confusing to new SharePoint developers because they think that all Elementsxml files have similar contents when in truth, the contents of Elementsxml are specific to the SharePoint project item type
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Listing 2-1: The Elementsxml file defining event receivers for four list item events
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The contents of the Elementsxml file have a root element called Elements Elements has a child element called Receivers Receivers contains a
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2: SharePoint Development in Visual Studio 2010
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Receiver element for each of the four event receivers we defined for our Event Receiver project item Each Receiver element contains 5 subelements listed in Table 2-5 You might also notice the ListTemplateId attribute, which is set to 104 To find out where this magic number comes from, use the Server Explorer that we saw in 1 to browse the site Under Team Site, List Templates, Communications select the Announcements list template In the Properties window, you will see that its Type_Client property is 104 The number 104 tells SharePoint to associate the event receiver with the Announcements list definition
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TABLE 2-5: Subelements Contained within the Receiver Element in Elementsxml
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Element Name Type
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Description The name of the receiver The type of the event handler; this name is defined by SharePoint and must also match the name of the method defined in the class handling the event The full name of the assembly where the event handler for this event is defined; Visual Studio allows a token to be used here, $SharePointProjectAssemblyFullName$, which will be replaced with the full name of the assembly when the project is built The fully qualified name of the class where the event handler for this event is defined, eg, SharePointProject1EventReceiver1EventReceiver1 The number inside the SequenceNumber element defines the order in which events are executed If there are two or more event receivers and they are handling the same events, the one that has the smallest number in the SequenceNumber element is executed first
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Assembly
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Class
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SequenceNumber
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As you might imagine, the Elementsxml or element manifest for other SharePoint project item types contains different content that defines that particular SharePoint project item type Every Elementsxml file, regardless of type, has a root element called Elements, however
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Creating a SharePoint Solution The Code File (EventReceiver1cs)
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Below the SharePoint project item node EventReceiver1 you will see a code file called EventReceiver1cs, shown in Listing 2-2 This contains a class that derives from MicrosoftSharePointSPItemEventReceiver Event handlers are added with calls to the base class implementation of the event handler Note that the names of these event handlers map to the names used in the Elementsxml file
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Listing 2-2: EventReceiver1cs
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2: SharePoint Development in Visual Studio 2010
 
We will add some code to the ItemDeleting and ItemAdded event as shown in Listing 2-3 In ItemDeleting, we first call the base ItemDeleting method Then we use the properties parameter that is passed to the function and use the ListItem property The ListItem property is a parameterized property to which we can pass a field name to read and write a field from the item being deleted from the list We use the ListItem property to access the Title field and append the Title field with an asterisk Next, we call the Update method on the ListItem to update the item being deleted with the new Title Finally, we use the Cancel property on the properties parameter to cancel the deletion of the item We can stop an item from being deleted in the ItemDeleting event because this event is fired before the item is deleted the ItemDeleted event happens after the item is deleted, so putting this code into that event would not work We also add code to the ItemAdded event Here, we again use the ListItem property on the properties parameter passed to the event We modify the Title to add the string added to it after it is added to the list We then call the Update method on the ListItem to update the item that was added so our change will be shown in the list